All four people being questioned as part of the investigation into the death of Katy French have been released.
They were released after their period of detention expired.
Files are being prepared for the Director of Public Prosecutions.
Katy French, 24, died last December in Our Lady's Hospital in Navan after being in a coma for nearly five days. A post mortem examination revealed she died of brain damage but it also showed traces of cocaine in her body.
Throughout the day gardaí continued to question the three people they had arrested yesterday. A 19-year-old man was detained today.
All four faced questions about possible offences under the misuse of drugs act.
